<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>navigator</title>
    <style>
       
        button{
            width: 100px;
            height: 100px;
            margin: 0 auto;
        }
    </style>
</head>
<body>
    <button id="anniu">
        点击获取浏览器信息
    </button>
    <script>
        var anniu=document.getElementById('anniu');
        anniu.onclick=function(){
            alert(navigator.appName);
        }
    </script>
</body>
</html>